Switchgear

Abstract

The switchgear includes a vacuum circuit breaker that is disposed in a circuit breaker chamber compartmented by a grounded metal plate, a busbar that is disposed in a busbar chamber and connected to the vacuum circuit breaker through a conductor, a cable that is disposed in a cable chamber and connected at one end to a load side, and a grounding device that is operated by a grounding device actuator disposed in a grounding device actuator chamber, connected to the vacuum circuit breaker through a conductor, and connected to the other end of the cable. The busbar is formed by a solid-insulated busbar. The conductor connecting the vacuum circuit breaker to the busbar and the conductor connecting the vacuum circuit breaker to the grounding device are both formed by a solid-insulated conductor. The circuit breaker chamber and the grounding device have a sealed structure.

The invention claimed is: 
     
       1. Switchgear comprising:
 a housing that contains a circuit breaker chamber, a busbar chamber, a cable chamber, a grounding device actuator chamber, and a control chamber, which are partitioned by a grounded metal plate; 
 a vacuum circuit breaker that is disposed in the circuit breaker chamber; 
 a busbar that is disposed in the busbar chamber and connected to the vacuum circuit breaker through a conductor; 
 a cable that is disposed in the cable chamber and connected at one end to a load side; and 
 a grounding device that is operated by a grounding device actuator disposed in the grounding device actuator chamber, connected to the vacuum circuit breaker through a conductor, and connected to the other end of the cable; 
 wherein the busbar is formed by a solid-insulated busbar; 
 wherein the conductor connecting the vacuum circuit breaker to the busbar and the conductor connecting the vacuum circuit breaker to the grounding device are both formed by a solid-insulated conductor; and 
 wherein the circuit breaker chamber and the grounding device have a sealed structure. 
 
     
     
       2. The switchgear according to  claim 1 , wherein the sealed structure of the circuit breaker chamber is obtained by sealing a box-shaped body with a seal material; and wherein the sealed structure of the grounding device is obtained by covering a main circuit section of the grounding device with an insulator and sealing the covered main circuit section with a seal material. 
     
     
       3. The switchgear according to  claim 1 , wherein the circuit breaker chamber and the grounding device are pressurized to a predetermined pressure. 
     
     
       4. The switchgear according to  claim 3 , wherein the circuit breaker chamber and the grounding device are pressurized to a pressure of 1 to 5 atmospheres. 
     
     
       5. The switchgear according to  claim 1 , wherein, from top to bottom, the control chamber, the circuit breaker chamber, and the grounding device actuator chamber are disposed on the front side of the housing; and wherein, from top to bottom, the busbar chamber and the cable chamber are disposed on the rear side of the housing. 
     
     
       6. The switchgear according to  claim 1 , wherein the grounding device is disposed in the cable chamber. 
     
     
       7. The switchgear according to  claim 1 , wherein the grounding device is partly positioned in the cable chamber while the remaining portion of the grounding device is positioned in the grounding device actuator chamber. 
     
     
       8. The switchgear according to  claim 1 , wherein the vacuum circuit breaker in the circuit breaker chamber is capable of not only being moved, but also being inserted into and extracted from the circuit breaker chamber by a vacuum circuit breaker insertion/extraction rod. 
     
     
       9. Switchgear comprising:
 a housing that contains a circuit breaker chamber, a busbar chamber, a cable chamber, a grounding device actuator chamber, and a control chamber, which are partitioned by a grounded metal plate; 
 a vacuum circuit breaker that is disposed in the circuit breaker chamber; 
 a busbar that is disposed in the busbar chamber and connected to the vacuum circuit breaker through a conductor; 
 a cable that is disposed in the cable chamber and connected at one end to a load side; and 
 a grounding device that is operated by a grounding device actuator disposed in the grounding device actuator chamber, connected to the vacuum circuit breaker through a conductor, and connected to the other end of the cable; 
 wherein the busbar is formed by a solid-insulated busbar; 
 wherein the conductor connecting the vacuum circuit breaker to the busbar and the conductor connecting the vacuum circuit breaker to the grounding device are both formed by a solid-insulated conductor; and 
 wherein at least the circuit breaker chamber and the grounding device are pressurized to a predetermined pressure. 
 
     
     
       10. The switchgear according to  claim 9 , wherein the circuit breaker chamber and the grounding device are pressurized to a pressure of 1 to 5 atmospheres. 
     
     
       11. The switchgear according to  claim 9 , wherein, from top to bottom, the control chamber, the circuit breaker chamber, and the grounding device actuator chamber are disposed on the front side of the housing; and wherein, from top to bottom, the busbar chamber and the cable chamber are disposed on the rear side of the housing. 
     
     
       12. The switchgear according to  claim 9 , wherein the grounding device is disposed in the cable chamber. 
     
     
       13. The switchgear according to  claim 9 , wherein the grounding device is partly positioned in the cable chamber while the remaining portion of the grounding device is positioned in the grounding device actuator chamber. 
     
     
       14. The switchgear according to  claim 13 , wherein the circuit breaker chamber, the grounding device, and the grounding device actuator chamber are pressurized to a predetermined pressure. 
     
     
       15. The switchgear according to  claim 14 , wherein the circuit breaker chamber, the grounding device, and the grounding device actuator chamber are pressurized to a pressure of 1 to 5 atmospheres.